Figure 5. Rnd proteins activate p190 molecules in vitro.
(A) In vitro GAP assays using fluorophore-labeled PBP to detect GTP hydrolysis. PBP and GTP-loaded RhoA was mixed with GST,GST-Rnd3, or GST-Rnd3(T55A) in the absence or presence of purified p190A (A), and the rates of RhoA GTP hydrolysis were measured as described in Experimental Procedures.
(B) Activation of p190A- or p190B-mediated RhoA GTP hydrolysis by addition of GST-Rnd1, GST-Rnd2, or GST-Rnd3 (calculated as described in Experimental Procedures). The data shown represent the mean and SD of three independent experiments.